Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: Poster: Polymer Dynamics

CPP 18.12: Poster

Tuesday, March 12, 2013, 18:15–20:15, Poster C

Study of PEG loaded Nonionic Microemulsions using DLS — •Philipp Gramlich, Andreas Bischof, Andreas Weber, and Bernd Stühn — Experimental Condensed Matter Physics, TU Darmstadt

We study the behaviour of polymer loaded nonionic w/o-microemulsions in droplet phase using dynamic light scattering methods. The microemulsions are water-C12E4-octane mixtures with different concentrations of PEG 1500. We keep a steady relation ω = 10 between water molecules per surfactant molecules as well as a constant volume fraction φ = 0.1 of water plus surfactant to total volume while varying the polymer content. Experiments are performed in a temperature range from 10 to 70 degrees Celsius. Coefficents of translational and rotational diffusion are measured and used to compute hydrodynamic radii. Special attention is given to the possible change between droplets and lamellar/bicontinuous structures in the proximity of phase transistions. Additionally we performed SANS and SAXS as well as transmissional and dielectric measurments.

The addition of PEG 1500 strongly affects the hydrodynamic radii extracted by DLS. Furthermore the hydrodynamic radii differ greatly for different temperatures which cannot be explained solely by a change of viscosity for any of the components.